Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Meteorology

Discipline
Institution
Publication Year
Publication
Publication Type
File Type

Articles 271 - 300 of 2497

Full-Text Articles in Entire DC Network

The Shape Of The Main Thermocline, Revisited, Rick Salmon Jan 2010

The Shape Of The Main Thermocline, Revisited, Rick Salmon

Journal of Marine Research

Using the Monte Carlo method of statistical physics, we compute the equilibrium statistical mechanics of the shallow water equations, considered as a reduced-gravity model of the ocean's upper layer in a square ocean that spans the equator. The ensemble-averaged flow comprises a westward drift at low latitudes, associated with the poleward deepening of the main thermocline, and a more intense compensating eastward flow near the latitudes at which the layer depth vanishes. Inviscid numerical simulations with a model that exactly conserves mass, energy, and potential enstrophy support the theoretical prediction.

Go to article

The Global Oceanic Freshwater Cycle: A State-Of-The-Art Quantification, J. J. Schanze, R. W. Schmitt, L. L. Yu Jan 2010

The Global Oceanic Freshwater Cycle: A State-Of-The-Art Quantification, J. J. Schanze, R. W. Schmitt, L. L. Yu

Journal of Marine Research

The current capabilities of quantifying the oceanic freshwater cycle are shown based on new observations from satellite data and re-analysis models for evaporation and precipitation over the ocean. For this purpose, we analyze the homogeneity and internal consistency of eight evaporation and seven precipitation products. Discontinuities are found around 1987 for all datasets, attributable to the launch of a microwave imaging satellite. Based on a review of comparisons with independent data and these analyses, the Global Precipitation Climatology Project (GPCP) and the Objectively Analyzed Ocean-Atmosphere Fluxes (OAFlux) evaporation product are combined with a state-of-the-art river discharge dataset to produce a …

Go to article

Breaking Internal Waves And Turbulent Dissipation, S. A. Thorpe Jan 2010

Breaking Internal Waves And Turbulent Dissipation, S. A. Thorpe

Journal of Marine Research

We explore what might be discovered about the breaking of progressive internal waves and the consequent mixing by following some of the methodologies and techniques used to study surface wave breaking. It is suggested that breaking is most likely to occur in wave groups, where the wave field is locally amplified. In a stratified fluid of uniform buoyancy frequency, N, the breaking regions of internal wave groups extend in approximately horizontal directions. Two classes of breaking, “convective overturn” and “shear instability,” are possible in progressive internal waves propagating in uniform stratification with no mean shear. Convective overturning and associated …

Go to article

On The Variability Of Gulf Stream Transport From Seasonal To Decadal Timescales, T. Rossby, C. Flagg, K. Donohue Jan 2010

On The Variability Of Gulf Stream Transport From Seasonal To Decadal Timescales, T. Rossby, C. Flagg, K. Donohue

Journal of Marine Research

Given the Gulf Stream's central role in the North Atlantic's wind-driven and meridional overturning circulation (MOC), there is considerable interest in measuring mass and heat flux to sufficient accuracy that their variability can be quantified with some degree of confidence. Here we combine high-resolution direct measurements of upper ocean transport from the last 17 years of Oleander ADCP data with previously published estimates of baroclinic transport to examine Gulf Stream transport variability over the last 80 years just downstream of where the current separates from the U.S. east coast.By far the greatest source of variability occurs on short time scales …

Go to article

When And Why Does Bioturbation Lead To Diffusive Mixing?, Filip J. R. Meysman, Bernard P. Boudreau, Jack J. Middelburg Jan 2010

When And Why Does Bioturbation Lead To Diffusive Mixing?, Filip J. R. Meysman, Bernard P. Boudreau, Jack J. Middelburg

Journal of Marine Research

Bioturbation in aquatic sediments results from many different biological activities, inducing particle displacement over a variety of length and time scales. Despite this inherent complexity, empirical tracer studies show that bioturbational mixing is often well described by a simple diffusive model. To resolve this apparent contradiction between biological complexity and modeling simplicity, we present an investigation into the diffusive nature of bioturbation. To this end, we examine a stochastic description of bioturbation, where particle mixing is described as a sequence of random bioturbation events. Particle movement is governed by three basic variables: the direction of jumping, the jumping distance, and …

Go to article

Tides And Overtides In Long Island Sound, Diane C. Bennett, James O'Donnell, W. Frank Bohlen, Adam Houk Jan 2010

Tides And Overtides In Long Island Sound, Diane C. Bennett, James O'Donnell, W. Frank Bohlen, Adam Houk

Journal of Marine Research

Using observations obtained by acoustic Doppler profilers and coastal water level recorders, we describe the vertical and horizontal structure of the currents and sea level due to the principal tidal constituents in Long Island Sound, a shallow estuary in southern New England. As expected, the observations reveal that M2 is the dominant constituent in both sea surface and velocity at all depths and sites. We also find evidence that the vertical structure of the M2 tidal current ellipse parameters vary with the seasonal evolution of vertical stratification at some sites. By comparing our estimates of the vertical structure …

Go to article

Effect Of Nutrient Input Frequency On The Structure And Dynamics Of The Marine Pelagic Community: A Modeling Approach, D. Macias, E. Ramírez-Romero, C. M. García Jan 2010

Effect Of Nutrient Input Frequency On The Structure And Dynamics Of The Marine Pelagic Community: A Modeling Approach, D. Macias, E. Ramírez-Romero, C. M. García

Journal of Marine Research

An analysis of the induced changes in both total productivity and community structure as a consequence of different pulsed nutrient inputs has been made by using two different ecosystem modeling tools. One was a modified version of the N-based model proposed by Fasham et al. (1990) for pelagic ecosystems and the other the plankton functional type model by Vichi et al. (2007). Both models lead to higher total biomass production with a pulsed nutrient input compared to a continuous supply, affecting both phytoplankton and zooplankton. Detailed responses are, however, different among plankton groups depending on the frequency of pulsed nutrient …

Go to article

On The Coastal-Upwelling Overturning Cell, R. E. Davis Jan 2010

On The Coastal-Upwelling Overturning Cell, R. E. Davis

Journal of Marine Research

The overturning cell driven by alongshore wind and coastal upwelling off central California is examined using direct observations from four underwater gliders equipped with Acoustic Doppler Profilers. These show the onshore flow that compensates for offshore Ekman transport during the month of August 2006 to occur primarily just below the Ekman Layer so that the net offshore heat transport, and by inference the net vertical transport of nutrients, is much less than if this compensating flow occurred throughout the water column. Correlation of cross-shelf flow and wind stress is used to infer the profile of Ekman transport while glider-measured alongshore …

Go to article

Influence Of Warm Sst Anomalies Formed In The Eastern Pacific Subduction Zone On Recent El Niño Events, Dong-Kyu Lee, Peter Niiler Jan 2010

Influence Of Warm Sst Anomalies Formed In The Eastern Pacific Subduction Zone On Recent El Niño Events, Dong-Kyu Lee, Peter Niiler

Journal of Marine Research

Anomalous April–June warm surface water in the eastern Pacific convergence zone (the Great Pacific Garbage Patch) subducts and depresses the thermocline as a single waveform. This waveform propagates toward the equator much more quickly (reaching the equator in 1.5–2.5 years) than the normal transit time (5–10 years) of the meridional overturning cell. The movements of the sea-surface temperature (SST) anomalies that occurred before the 1997 and 2009 El Niños can be clearly traced to the area south of 20°N using the altimeter sea-level signals. Upon arriving near the Pacific equator, these warm water anomalies can contribute to the formation of …

Go to article

Topography, Jets, And Eddy Mixing In The Southern Ocean, Jianhua Lu, Kevin Speer Jan 2010

Topography, Jets, And Eddy Mixing In The Southern Ocean, Jianhua Lu, Kevin Speer

Journal of Marine Research

The relation between topography, and the 3D structure of patchy eddy-induced mixing in the Southern Ocean is analyzed descriptively by applying diagnostic methods to output from the Southern Ocean State Estimate. A localized cumulative probability density function method is developed to verify the use of Nakamura's (2001) mixing efficiency in the ocean. Both methods reveal enhanced eddy mixing at mid-depths. The spatial pattern of the mid-depth enhancement of eddy mixing is primarily linked to the merging of multiple jets embedded in the Antarctic Circumpolar Current over topography. We suggest that enhanced eddy mixing over topography is due to locally enhanced …

Go to article

Excitation Of Sst Anomalies In The Eastern Equatorial Pacific By Oceanic Optimal Perturbations, Florian Sévellec, Alexey V. Fedorov Jan 2010

Excitation Of Sst Anomalies In The Eastern Equatorial Pacific By Oceanic Optimal Perturbations, Florian Sévellec, Alexey V. Fedorov

Journal of Marine Research

A generalized stability analysis is used to explore the excitation of sea-surface temperature anomalies in the eastern equatorial Pacific by optimal initial perturbations in temperature and salinity within an ocean general circulation model. We find perturbations that can efficiently modify the SST of the Nino3 region with an approximately 9-month delay. The time interval between the end of March and mid-April is particularly favorable for these perturbations to cause subsequent changes in the eastern equatorial Pacific. This sensitivity is related to two critical factors: during the boreal spring Equinox the heat content of the western equatorial Pacific reaches its seasonal …

Go to article

Mixing Rates Across The Gulf Stream, Part 2: Implications For Nonlocal Parameterization Of Vertical Fluxes In The Surface Boundary Layers, R. Inoue, R. R. Harcourt, M. C. Gregg Jan 2010

Mixing Rates Across The Gulf Stream, Part 2: Implications For Nonlocal Parameterization Of Vertical Fluxes In The Surface Boundary Layers, R. Inoue, R. R. Harcourt, M. C. Gregg

Journal of Marine Research

The turbulent kinetic energy (TKE) budget of the surface mixed layer is evaluated at wintertime stations occupied in the vicinity of the strong Gulf Stream (GS) jet. The nonlocal K-profile parameterization (KPP) of vertical fluxes is combined with observed hydrography and meteorology to diagnose TKE production. This KPP-based production is averaged over the surface mixed layer and compared with corresponding averages of observed TKE dissipation rate from microstructure measurements, under assumptions of a homogeneous steady-state balance for the layer-averaged TKE budget. The KPP-based TKE production estimates exceed the mean observed boundary layer dissipation rates at occupied stations by up to …

Go to article

Landscape And Smaller-Scale Effects Of Lugworm (Arenicola Marina) Deposit Feeding On Benthic Bacterial Assemblages, Craig J. Plante Jan 2010

Landscape And Smaller-Scale Effects Of Lugworm (Arenicola Marina) Deposit Feeding On Benthic Bacterial Assemblages, Craig J. Plante

Journal of Marine Research

Objectives of this study were to (1) determine whether feeding by the lugworm, Arenicola marina, reduces abundance or alters composition of sedimentary bacterial assemblages, (2) examine recovery of “disturbed” patches of egesta, and (3) test for effects on bacterial abundance, diversity and composition at spatial scales larger than individual fecal mounds. Field comparative studies in Lubec, Maine, were conducted to test for the effects of ingestion, and manipulative experiments were done to assess rates and mechanisms of recolonization of egesta. Bacterial assemblage attributes were followed using epifluorescence microscopy and DGGE analysis of 16S rDNA. Next we examined landscape-scale effects …

Go to article

South Atlantic Mass Transports Obtained From Subsurface Float And Hydrographic Data, Regina R. Rodrigues, Mark Wimbush, D. Randolph Watts, Lewis M. Rothstein, Michel Ollitrault Jan 2010

South Atlantic Mass Transports Obtained From Subsurface Float And Hydrographic Data, Regina R. Rodrigues, Mark Wimbush, D. Randolph Watts, Lewis M. Rothstein, Michel Ollitrault

Journal of Marine Research

Mean total (barotropic + baroclinic) mass transports of the oceanic top 1000 dbar are estimated for two regions of the South Atlantic between 18°S and 47°S. These transports are obtained by using Gravest Empirical Mode (GEM) fields calculated from historical hydrography with temperature and position data from quasi-isobaric subsurface floats deployed from 1992 through 2001. The float-GEM-estimated total mass transports reveal a Brazil Current with a southward flow of 20.9 Sv at 30°S and 46 Sv at 35°S (1 Sverdrup, Sv = 106 m3 s–1). Two recirculation cells are identified in the southwest corner of the …

Go to article

To The Oceanographic Community, George Veronis Jan 2010

To The Oceanographic Community, George Veronis

Journal of Marine Research

I became Editor of the Journal of Marine Research in January of 1973 and resigned with the November, 2009 issue; although, in fact, Ken Brink essentially took over the task during the summer of 2009, when I ended up in the hospital for a period of six-months. As of this issue (Volume 68, Number 1), Ken becomes the official Editor.

Go to article

The Relation Between The Duration And Shape Of Internal Wave Groups, S. A. Thorpe Jan 2010

The Relation Between The Duration And Shape Of Internal Wave Groups, S. A. Thorpe

Journal of Marine Research

This paper discusses the effect of the shape of internal wave groups on their “duration” or “lifetime”—how long they retain their form before their component waves disperse. The methodology devised by Smith and Brulefert (2010) to study the dispersion of surface wave groups is extended to examine the dispersion of internal wave groups. To provide tangible examples, it is supposed that wave groups of ellipsoidal shape, symmetrical about a vertical plane, are generated in a uniformly stratified thermocline by moving periodic disturbances perturbing the base of an overlying mixed layer. The dispersion relation for internal waves is used to determine …

Go to article

Topographic Rectification In A Forced, Dissipative, Barotropic Ocean, K. H. Brink Jan 2010

Topographic Rectification In A Forced, Dissipative, Barotropic Ocean, K. H. Brink

Journal of Marine Research

Barotropic current rectification by topographic irregularities is treated for a case with bottom friction and fluctuating forcing. Geometries both with underlying shelf-slope topography and with no mean topographic slope are considered. In common with many previous studies of this sort, the resulting time-mean flow roughly follows isobaths in the direction that long topographic Rossby waves travel, but the mean flow often deviates locally from this rule. Further, as might be expected, there is an area-averaged correlation of pressure and bottom slope in the sense that would propel the mean flow. If the topographic irregularities have a length scale shorter than …

Go to article

Mixing Rates Across The Gulf Stream, Part 1: On The Formation Of Eighteen Degree Water, R. Inoue, M. C. Gregg, R. R. Harcourt Jan 2010

Mixing Rates Across The Gulf Stream, Part 1: On The Formation Of Eighteen Degree Water, R. Inoue, M. C. Gregg, R. R. Harcourt

Journal of Marine Research

Microstructure profiles taken in February 2007 across the Gulf Stream (GS) measured the temporal and spatial variability of the intense mixing that forms Eighteen Degree Water (EDW). Strong winds, gusting to 30 m s–1, and heat fluxes up to 1000 W m–2 produced moderate-to-strong mixing in the surface mixed layer and the entrainment zone, as well as in the thermocline. In the limit of a vertically balanced heat budget, EDW formation is driven primarily by surface heat loss to the atmosphere across a region extending O(100) km south from the GS core, where entrainment heat fluxes …

Go to article

Drifters In The Gulf Stream, G. G. Mcgrath, T. Rossby, J. T. Merrill Jan 2010

Drifters In The Gulf Stream, G. G. Mcgrath, T. Rossby, J. T. Merrill

Journal of Marine Research

In the past, the Gulf Stream has frequently been viewed as essentially a barrier between the Slope and Sargasso seas. On the other hand, surface drifters have often been observed to leave the stream to the south. To gain a better understanding of surface flow of the Gulf Stream, we used drifter trajectory data to study their drift east and patterns of loss from the current. Two sets of drifter data were used, one from the 1995–1999 Georges Bank GLOBEC program and the other from the Global Drifter Program. We also made use of atmospheric wind stress estimates from a …

Go to article

From Centennial To Millennial Oscillation Of The Thermohaline Circulation, Florian Sévellec, Thierry Huck, Alain Colin De Verdière Jan 2010

From Centennial To Millennial Oscillation Of The Thermohaline Circulation, Florian Sévellec, Thierry Huck, Alain Colin De Verdière

Journal of Marine Research

The freshwater flux intensity is used as the main control parameter to destabilize the ThermoHaline Circulation (THC): as it increases, the classical bifurcation scenario, thermal stable steady state, millennial oscillation and haline stable steady state are reproduced in a 2D zonally-averaged ocean model under mixed boundary conditions. Both bifurcations arise through global bifurcations leading to an infinite period of the limit cycle. Here we highlight a centennial oscillation important for the instability of the thermal phase of the millennial oscillation and which could be considered as a precursor to the collapse of the THC. It is suggested that the existence …

Go to article

Water-Mass Transformation In The Shelf Seas, Gualtiero Badin, Richard G. Williams, Jonathan Sharples Jan 2010

Water-Mass Transformation In The Shelf Seas, Gualtiero Badin, Richard G. Williams, Jonathan Sharples

Journal of Marine Research

The rate at which water masses are transformed from one density class to another is assessed in the shelf seas using the Walin (1982) framework. For a tidal-mixing front, the transformation is estimated using air-sea density fluxes and the diapycnal mixing diagnosed from a series of one-dimensional mixed layer models running across the shelf. These transformation rates diagnosed from the air-sea fluxes and diapycnal mixing agree with volume changes diagnosed directly from the model. The transformation from air-sea fluxes reaches a maximum amplitude typically twice that provided by diffusive mixing. This framework is extended to estimate the rate at which …

Go to article

Depth-Integrated Steric Height As A Tool For Detecting Non-Sverdrup Behavior In The Global Ocean, J. Stuart Godfrey, Jeff R. Dunn Jan 2010

Depth-Integrated Steric Height As A Tool For Detecting Non-Sverdrup Behavior In The Global Ocean, J. Stuart Godfrey, Jeff R. Dunn

Journal of Marine Research

Godfrey's (1989) (referred to below as G89) calculation of the global field of annual mean Depth-Integrated Steric Height, or Sverdrup et al.'s (1942) "Transport Function," (Q) is revisited, using newer products for wind stresses, temperature and salinity. Observed Q and its wind-estimated equivalent QW are compared more extensively along eastern oceanic boundaries than in G89. Q and QW are also compared along the inner edge of the Pacific western boundary, at locations where G89 theory suggests that such a comparison is possible. A similar comparison along the western Atlantic improves after a 16 Sv correction …

Go to article

The Effect Of Iron- And Light-Limitation On Phytoplankton Communities Of Deep Chlorophyll Maxima Of The Western Pacific Ocean, Zackary I. Johnson, Ragini Shyam, Anna E. Ritchie, Cecile Mioni, Veronica P. Lance, James W. Murray, Erik R. Zinser Jan 2010

The Effect Of Iron- And Light-Limitation On Phytoplankton Communities Of Deep Chlorophyll Maxima Of The Western Pacific Ocean, Zackary I. Johnson, Ragini Shyam, Anna E. Ritchie, Cecile Mioni, Veronica P. Lance, James W. Murray, Erik R. Zinser

Journal of Marine Research

The deep chlorophyll maximum (DCM) is a widespread feature in most stratified, oligotrophic waters. In addition to their well-established importance for many surface phytoplankton communities, more recent evidence suggests that iron, light or co-limitation may also be important drivers for some DCM communities. To test this hypothesis, we describe the results from six grow-out experiments, four from the Equatorial Pacific Ocean (between 150°E and 140°W), one in Western Pacific Warm Pool (9°S, 170°E) and one in the middle of the Tasman Sea (36°S). Photosynthetic efficiency (Fv/Fm) and biomass response, including Chl a and phytoplankton community structure (pennate diatoms, photosynthetic eukaryotes, …

Go to article

Moored Observations Of Bottom-Intensified Motions In The Deep Canada Basin, Arctic Ocean, M.-L. Timmermans, L. Rainville, L. Thomas, A. Proshutinsky Jan 2010

Moored Observations Of Bottom-Intensified Motions In The Deep Canada Basin, Arctic Ocean, M.-L. Timmermans, L. Rainville, L. Thomas, A. Proshutinsky

Journal of Marine Research

In the deep Canada Basin, below the sill depth (about 2400 m) of the Alpha-Mendeleyev Ridge, potential temperature and salinity first increase with depth, then remain uniform from about 2600 m to the bottom (approximately 3500 m). Year-long moored measurements of temperature, salinity and pressure in these deep and homogeneous bottom waters reveal significant vertical excursions with periods of about 50 days. The observed isopycnal displacements have amplitudes up to 100 m at the top boundary of the bottom layer; moored profiler measurements in the intermediate water column indicate that the amplitudes of these vertical displacements decay toward the surface …

Go to article

Sea Ice Melt And Meteoric Water Distributions In Nares Strait, Baffin Bay, And The Canadian Arctic Archipelago, Matthew B. Alkire, Kelly K. Falkner, Timothy Boyd, Robie W. Macdonald Jan 2010

Sea Ice Melt And Meteoric Water Distributions In Nares Strait, Baffin Bay, And The Canadian Arctic Archipelago, Matthew B. Alkire, Kelly K. Falkner, Timothy Boyd, Robie W. Macdonald

Journal of Marine Research

Sea ice melt (SIM), meteoric water (river runoff net precipitation), and Pacific seawater contributions to the upper waters of the Canadian Arctic Archipelago (CAA), Nares Strait, and Baffin Bay during late summer 1997 and 2003 are estimated from salinity, δ18O, and nutrient data. Salinity-δ18O relationships within the study area suggest that the CAA inherits a net sea-ice formation (brine) signal from the Arctic Ocean. Inherited brine complicates the estimation of local contributions from sea ice melt and glacial runoff, especially where a significant component of the surface water derives from Arctic outflow. Our data are characterized …

Go to article

Investigation Of The Physicochemical Features And Mixing Of East/Japan Sea Intermediate Water: An Isopycnic Analysis Approach, Il-Nam Kim, Dong-Ha Min, Dae Hyun Kim, Tongsup Lee Jan 2010

Investigation Of The Physicochemical Features And Mixing Of East/Japan Sea Intermediate Water: An Isopycnic Analysis Approach, Il-Nam Kim, Dong-Ha Min, Dae Hyun Kim, Tongsup Lee

Journal of Marine Research

We present spatial distributions of the mixing ratio and properties of the East/Japan Sea Intermediate Water (ESIW) at its core density layer (σθ = 27.2–27.3) based on high-quality hydrographic data observed in the East/Japan Sea (EJS) during summer 1999. ESIW is defined as a source water type showing minimum salinity and maximum dissolved oxygen concentration. ESIW plays an important role in supplying dissolved oxygen and transporting anthropogenic carbon into the intermediate/deep layers in EJS. Studying the ESIW formation and distribution processes may provide insights on EJS's shallow- to mid-depth thermohaline circulation and recent ocean changes. Here, we combine the …

Go to article

Measuring Lateral Heat Flux Across A Thermohaline Front: A Model And Observational Test, Barry R. Ruddick, Neil S. Oakey, Dave Hebert Jan 2010

Measuring Lateral Heat Flux Across A Thermohaline Front: A Model And Observational Test, Barry R. Ruddick, Neil S. Oakey, Dave Hebert

Journal of Marine Research

We develop and test a method to observationally estimate lateral intrusive heat flux across a front. The model combines that of Joyce (1977), in which lateral cross-frontal advection by intrusions creates vertical temperature gradients, and Osborn and Cox (1972) in which vertical mixing of those gradients creates thermal microstructure that is dissipated by molecular conduction of heat. Observations of thermal microstructure dissipation χT are then used to estimate the production by intrusions, and hence the lateral heat flux and diffusivity. This method does not depend on the precise mechanism(s) of mixing, or on the dynamical mechanisms driving the frontal …

Go to article

National Urban Database And Access Portal Tool, Nudapt, Jason Ching, Michael Brown, Steven Burian, Fei Chen, Ron Cionco, Adel Hanna, Torrin Hultgren, Timothy Mcpherson, David J. Sailor, Haider Taha, David Williams Aug 2009

National Urban Database And Access Portal Tool, Nudapt, Jason Ching, Michael Brown, Steven Burian, Fei Chen, Ron Cionco, Adel Hanna, Torrin Hultgren, Timothy Mcpherson, David J. Sailor, Haider Taha, David Williams

Mechanical and Materials Engineering Faculty Publications and Presentations

Based on the need for advanced treatments of high resolution urban morphological features (e.g., buildings, trees) in meteorological, dispersion, air quality and human exposure modeling systems for future urban applications, a new project was launched called the National Urban Database and Access Portal Tool (NUDAPT). NUDAPT is sponsored by the U.S. Environmental Protection Agency (USEPA) and involves collaborations and contributions from many groups including federal and state agencies and from private and academic institutions here and in other countries. It is designed to produce and provide gridded fields of urban canopy parameters for various new and advanced descriptions of model …

Go to article

"A Pbs Mind In An Mtv World": Teaching Teenagers Meteorology By Placing A Weather Forecast On Mtv And The Creation Of The Concert Forecast, Victoria Leigh Shaw May 2009

"A Pbs Mind In An Mtv World": Teaching Teenagers Meteorology By Placing A Weather Forecast On Mtv And The Creation Of The Concert Forecast, Victoria Leigh Shaw

Theses and Dissertations

Studies show teenagers are influenced by television. This study tested the hypothesis that students can learn meteorology by viewing a weather forecast on Music Television (MTV). MTV was used because it is the network watched most by adolescents. Two surveys were administered to 175 high school students along with a DVD showing a weather forecast for MTV’s Spring Break. Half of the sample group was told the forecast was for MTV and the other was told it was for Channel One. Results showed that there was no statistically significant difference between MTV and Channel One in information recalled from the …

Go to article

Spatial Interactions In The Macoma Balthica Community Control Biogeochemical Fluxes At The Sediment-Water Interface And Microbial Abundances, Emma Michaud, Gaston Desrosiers, Robert C. Aller, Florian Mermillod-Blondin, Bjorn Sundby, Georges Stora Jan 2009

Spatial Interactions In The Macoma Balthica Community Control Biogeochemical Fluxes At The Sediment-Water Interface And Microbial Abundances, Emma Michaud, Gaston Desrosiers, Robert C. Aller, Florian Mermillod-Blondin, Bjorn Sundby, Georges Stora

Journal of Marine Research

We examined how interactions among the three dominant species of the Macoma balthica community in the St-Lawrence estuary influence net biogeochemical fluxes and the composition of the sedimentary bacterial community. We manipulated the biodiversity of the community via combinations of Macoma balthica, Mya arenaria, and Nereis virens in sediment microcosms containing sieved and homogenized tidal-flat sediment. Each combination was adjusted to similar total biovolumes and in situ animal densities. Compared to treatments with single species, which were also adjusted to similar biovolumes and densities, combinations of multiple species changed the fluxes of oxygen, phosphate, ammonium, and nitrate across the sediment-water …

Go to article

First Prev Next Last